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Finding the Fourth Proportional to 156.13, 215.45 and 86.19

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Solution

The fourth proportional to 156.13, 215.45 and 86.19 is: 118.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.13 : 215.45 = 86.19 : x
  2. Step 2: Convert to fraction form
    156.13/215.45 = 86.19/x
  3. Step 3: Cross multiply
    156.13x = 215.45 × 86.19
  4. Step 4: Simplify right side
    156.13x = 18,569.64
  5. Step 5: Solve for x
    x = 18,569.64/156.13
  6. Step 6: Final answer
    x = 118.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.